這是我的代碼: http://pastebin.com/kGZY0h88嘗試一個空對象上調用虛擬方法 'java.io.FileOutputStream中android.content.Context.openFileOutput(java.lang.String中,INT)'
每次我嘗試使用函數writeAll(ArrayList liste)保存某些內容時,應用程序崩潰。這裏是日誌:
`E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.naabi.listeserie, PID: 3459
java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.FileOutputStream android.content.Context.openFileOutput(java.lang.String, int)' on a null object reference
at com.example.naabi.listeserie.dao.SerialisationSerieDAO.writeAll(SerialisationSerieDAO.java:58)
at com.example.naabi.listeserie.descriptionMrRobot.onSaveInstanceState(descriptionMrRobot.java:260)
at android.app.Activity.performSaveInstanceState(Activity.java:1414)
at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1300)
at android.app.ActivityThread.callCallActivityOnSaveInstanceState(ActivityThread.java:4541)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4492)
at android.app.ActivityThread.-wrap19(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1483)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)`
我嘗試通過傾斜手機來使用該功能。
請不要只連接到您的代碼異地。你需要在問題本身中包含[mcve]。 –